Meclhanism for phonographs



T. M. SHANK.

DRIVING MECHANISNI FOR PHONOGRAPHS.

APPLICATION FILED NOV. 20|` 1918.

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I Patented J uly' 1, 1919.

-I. M. SHANK. DRIVI'NG- MEGHANISM FOR PHONOGRAPHS.

APPLICATION FILED'NOV. 20| 1918.

Patented July 1, 1919,

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- T. M. SHA'NK. l DRIVINGMECHANISM` FOR PHONOGRAPHS.

,APPLICATlON FILED NOV. 20, 19,18.

Y Patented J uly 1, 1919. 4 SHEETSAHEET a.

lf 5f T. M. SHANK. f DRIVING IVIECHANISM FOR PHONOGRAPHS.

APPLICATION FILED NOV. 20. i918.

Patented July 1,L 1919..

4 SHEETS- SHEET 4.

THOMAS M., SHANK, OF

BIDWELL, OHIO, ASSIGNOR OF ONE-HALF TO 'FECHAS' J. l OMEARA, OF CINCINNATI, OHIO.

DRIVING ICdICHANISM FOR FHONOGRAPHS.

Specification of Letters Patent.

Patented July 1, 1919.

Application filed November 20, 1918. .u Serial N o. 263,408.

To all-'whom t may concern:

lBe it known that I, THOMAS M. SHANK a l citizen of the United States, residing in lll Bidwell, in thecounty of Gallia and State of Ohio, have invented new and useful Improvements in a Drivin Phonographs, of which t e following is a specicati'on.

My invention has for an object to produce an improved phonograph in which the speed of the record disk with relation to the needle is maintained `uniform from the point of contact of the needle with the disk mit d@ i' larged scale, taken on the line 5-o-5 of Fig. 1.

at the outermost end of the sound record'v` groove to the point of contact at the innermost end of the sound record groove, for the purpose of permitting a greater numberof sound vibration :impressions tov be placed withinthe groove than is now permitted .by the uniform speed of rotation of therecord disk during the recording andreproducing operations. o

This and other objects are attainedin the phonograph described in the following specification and illustrated in the accompanying drawings in which- Figure -1 is an elevational sectional view of a phonograph embodying my invention.

Fig. 2 is a plan View of my 'improved phonograph, showing the turn table -removed, but the position thereof in dotted lines, the sound reproducing goose neck 'loe-y ingshlown broken away for convenience of illustration. o

Fig. 3 is a fragmental view upon an enlarged scale of a detail of my invention.

Fig. 4 is a, sectionaLelevation upon an enlarged scale, taken on the line 4-4 of Fie'. 1.

liig.l 5 isa sectionalelevation upon an en- Fig. 6 isia sectional'elevation upon an enlarged scale, taken on the line 6 6 of Fig. 1.

Fig.' 7 is an enlarged'fragmental elevation of the table rotating mechanism of the phonograph embodying my invention, at the outer edge of the turn table ready to start upon its travel toward the center of the 4turn table during the reproduction of.

Fig. 8 is an enlarged fragmental elevation of the table rotating mechanism of the phonograph embodying my invention, showing the position of the parts thereof upon arrival at the-inner limitof its travel upon Mechanism for 'extending from; plates '22 andy 23.

with a motor which is represented b the gears 9 and 10 which drive the vertically positioned shaft 11 upon which the turn table 12 is rotatively mountedupon a ball bearing 13. This ball bearin is located at` the upper end of a worm 14 wich is secured to shaft 11 and Which'drives a Worm gearf15 secured to a rotatively mounted shaft 16 extending transversely of thev phono raph. The right end of shaft 16 is provide with screw threads 17.

Upon the platform 18 of the phonograph cabinet I ave located tracks 19 and 20 upon which ia carriage 21 is reciprocally mounted. This carriage consists of two plates/22 and 23 between which gears 24, 25 and 26 are located. Gear 24`is splined upon a shaft 27 means the' gear 24 and the intermeshing I gears 25 and 26t are driven. Gear 26 is mounted upon a shaft'31 which carries a roller 32 which drives the turntable 12.`

Shaft 16 passes through plates 22 and 23 freely. Pivotally mounted at one end on -plate 22 is an arm, 33 whichl has a screw threaded notch 34 for engaging .the screw thread 17 of shaft 16. 4A spring 35 which is guided by a pin 36, is provided for normally holding arm 33 Velevated with -its screw threads in engagement with the screw threads of shaft 16. Pivotalxly mounted on a plate 37 secured to the fronts of plates 22 and 23 lis a T-shaped lever 38, short arm 39 of which 'is positioned to enga e the end of arm 33, the upper long arm 40 eingprovidedfor the attachment thereto of a coil spring 41 which is also attached to a-lu 42 lower -arm 43 of lever38 is adapted to engage .abutment pins 44 and45 atthe limits p oftravel of presently described. 4 l Extending from the carriagemlates are the carriage for a purpose to ube A fingers 46 and yr47t0 which the ends-of` springs 48 and 49 are attached.

4In the operation of my improved'phono# g graph the motor 'rotates shaft 11 in the' direction indicated by the arrow, and through gears 14, 15, and 29, 30, causes rotation of. the respective shafts 16 and 27. The splined connection of shaft 27 with gear 24 causes the rotation of turn table 12 through gears 25 and 26 to drive roller 32, while the rotation of shaft 16 causes movement of the carriage toward the center of the turn table when the screw threads 34 of arm 33 engage the screw threads 17 of shaft 16.

-At the beginning of the playing of a piece, the position of the friction rnller 32 is at the extreme edge of the turn table as shown in Fig.' 7. In this position the engagement-of abutment pin A44 with lever arm 43 -has caused the lever to swing to the position shown, being retained in this position by spring 41. Arm 39 is thus lifted from arm 33, which under the' action of spring 35 is lifted to engage .the screw` threads of shaft 16. With this shaft in rotation the .carria e is moved toward the center of the turn tab e, the rotation of shaft 27 simultaneously causing turn table driving action of roller 32.

As soon as the carriage reaches thc inner end of its travel the arm 43 engages pin 45 and causes lever 38 to jump into the position shown in Fig. 8 under influence of spring 41, thus removing arm 33 from engagement with screw threads 17 of shaft 16. The carriage is thus arrested in its movement and is instantly returned to its starting point by springs 48 and 49 attached to fingers 46 and 47, the inward movement of` the carriage having previously tensioned these springs.

.It will thus be seen that I have devised a phonograph in which the speed of the turn vtable at the point the needle qontacts the record, is always uniformthuspermitting of a greater number of sound waves to be recorded than has heretofore been possible upon standard size record disks.

Having thus described my invention what I claim is 1. A phonograph comprising a turntable, a Sound reproducer, a roller adapted to be driven to rotate the turntable, a feed screw adapted to move the roller toward the center of theturntable, mechanism adapted to rotate the roller andy feed screw, and means adapted automatically to return the roller to starting position upon reaching the center of the turntable.

2. A phonograph comprising a turntable, a sound producer, a roller adapted l,to be driven to rotate the turntable, a feed screw adapted to move the roller toward the center of the turntable, mechanism adapted to rotate the roller and feed screw at a uniform speed whereby the speed of the turn? table at the point of contact of the sound producer with a record located thereon will lbe uniform from start to inislrof the record, andv automatic means adapted to re-4 turn the roller to starting-position upon completionv of the playing of a record, consisting of a lever adapted to remove the roller from operative connection with the feed screw, means for operating the lever, and a spring forV returning the roller to a starting position.

In witness whereof, I aiix my signature in the presence oftwo witnesses.

THOMAS M. SHANK.

Witnesses:

WM. A. HOWARD, CLYDE- KELLER. 

